NDLI: New development of combined permanent-magnet type microspeakers used for cellular phones

Content Provider	IEEE Xplore Digital Library
Author	Sang-Moon Hwang Hong-Joo Lee Keum-Shik Hong Beom-Soo Kang Gun-Yong Hwang
Copyright Year	1965
Abstract	In mobile phones of multimedia era, microspeakers of high-quality sound are essential parts to generate human voice in speaker phone and MP3 song player. In this paper, two types of microspeakers, outer permanent magnet (PM) and combined PM type, are analyzed using electromagnetic, mechanical, acoustical and their coupling analysis. For performance comparison, voice coil diameter is chosen as a design parameter to change excitation position and magnet volume for both types. For combined PM type, sound pressure level (SPL) is improved due to increased PM volume compared to outer PM type. Also, with the decreased voice coil diameter for combined PM type, the 1st resonant mode of the diaphragm is more efficiently excited due to concentrative excitation, resulting in lower and broader frequency range. Therefore, it can be said that the combined PM type microspeakers are more advantageous for high performance microspeaker which are essential for multimedia era.
Sponsorship	IEEE Magnetics Society
Starting Page	2000
Ending Page	2003
Page Count	4
File Size	683952
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cellular phones Electromagnetic analysis Magnetic analysis Electromagnetic coupling Coils Mobile handsets Human voice Loudspeakers Digital audio players Permanent magnets microspeaker Broadband finite-element method (FEM) magnetic circuit
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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